feat(string): improve trim() to handle Excel control characters

Author: SlimDeluxe

src/Fluent/FluentString.php

@@ -437,13 +437,18 @@ public function uppercaseFirst(): self
     }
 
     /**
-     * Trim the string - supports unicode spaces
+     * Trim the string - supports Unicode spaces and Excel control characters
      *
      * @return $this
      */
     public function trim(): self
     {
-        $this->value = preg_replace('/^[\pZ\pC]+|[\pZ\pC]+$/u', '', $this->value);
+        // 1) Remove Excel’s inline CR/LF escape tokens that appear as text
+        //    Handles case-insensitive _x000D_ and _x000A_
+        $this->value = preg_replace('/^(_x000[da]_)+|(_x000[da]_)+$/i', '', $this->value);
+
+        // 2) Now trim real Unicode separators and control chars, including CR/LF
+        $this->value = preg_replace('/^[\pZ\pC]+|[\pZ\pC]+$/u', '', trim($this->value));
 
         return $this;
     }

tests/Unit/Fluent/FluentStringTest.php

@@ -357,6 +357,11 @@ public function testTrim(): void
     {
         $this->assertEquals('Test', str('Test')->trim());
         $this->assertEquals('Test', str("\u{2000}\u{2001}\u{2002}\u{2003}\u{2004}\u{2005}\u{2006}\u{2007}\u{2008}\u{2009}Test\u{2000}\u{2001}\u{2002}\u{2003}\u{2004}\u{2005}\u{2006}\u{2007}\u{2008}\u{2009}")->trim());
+
+        $this->assertEquals('Test', str('Test_x000d_')->trim());
+        $this->assertEquals('Test', str('_x000d_Test')->trim());
+        $this->assertEquals('Test', str('_x000d_Test_x000d_')->trim());
+        $this->assertEquals('Test one _x000d_ two three', str('_x000d_Test one _x000d_ two three_x000d_')->trim());
     }
 
     public function testIsEmailDomainValid(): void